exam Maths Puzzle Numerical Ability

Solve the system by addition. x + y = 4
x - y = 10

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exam Other Question

convert the equation to expanded form.

1) y=(x+3)^+2

2) y+(x-b/2)^

3)y=2(x-4)^-1

4)y/6=(x-1/2)^ what is -.031 (with 31 repeating) written as a quotient of two integers